US4470314A - Measuring apparatus of the vibratory string type - Google Patents

Measuring apparatus of the vibratory string type Download PDF

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Publication number
US4470314A
US4470314A US06/448,483 US44848382A US4470314A US 4470314 A US4470314 A US 4470314A US 44848382 A US44848382 A US 44848382A US 4470314 A US4470314 A US 4470314A
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US
United States
Prior art keywords
mounting block
string
body member
pair
front face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/448,483
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English (en)
Inventor
Peter Weber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mettler Toledo GmbH Germany
Original Assignee
Mettler Instrumente AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mettler Instrumente AG filed Critical Mettler Instrumente AG
Assigned to METTLER INSTRUMENTE AG reassignment METTLER INSTRUMENTE AG ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WEBER, PETER
Application granted granted Critical
Publication of US4470314A publication Critical patent/US4470314A/en
Assigned to METTLER-TOLEDO AG (METTLER-TOLEDO SA) (METTLER-TOLEDO LTD), IM LANGACHER GREIFENSEE, SWITZERLAND reassignment METTLER-TOLEDO AG (METTLER-TOLEDO SA) (METTLER-TOLEDO LTD), IM LANGACHER GREIFENSEE, SWITZERLAND CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). NOVEMBER 24, 1989 Assignors: METTLER INSTRUMENTE AG
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
    • G01L1/106—Constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/16—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of frequency of oscillations of the body
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S73/00—Measuring and testing
    • Y10S73/01—Vibration

Definitions

  • An improved measuring apparatus is disclosed of the known vibratory or oscillatory string type, as evidenced, for example by the prior U.S. patents to Wirth et al. No. 3,621,713, Streater et al. 3,712,395, and Meier Nos. 3,897,681 and 3,963,082, and the Swiss application No. CH 8198/81.
  • Such instruments have utility as weighing devices (with one or more strings), as actual dynamometers, or as an instrument having a reference mass against which other masses are compared (i.e., a massmeter).
  • the load-change-responsive frequency variations produced in one or more strings that oscillate laterally in a magnetic field are measured and converted into a weighing result that is displayed (by digital display means, for example).
  • String measuring type instruments are also used as an extensometer for measuring the change in the length of an object.
  • the primary object of the present invention is to provide an improved instrument of the vibratory string measuring type which is more readily and inexpensively assembled than the known devices without impairing the operational qualities of the instrument.
  • the structural body component be a molded part formed of an electrically insulating synthetic plastic material, that it contain recesses for receiving the exciter magnet system as well as the support for the fixed end of the string, and it furthermore contains apertures for attachment to a console.
  • This concept makes it possible, prior to the assembly of the entire instrument, to mount the pre-assembled actual structural component whose attachment in the instrument then only requires a few motions of the hand.
  • the structural component according to the invention can, according to known techniques, be mass produced rather accurately in terms of the required dimensions, for example, by means of injection molding techniques.
  • the apertures for attaching the body member to the console are perferably arranged asymmetrically relative to the vertically arranged measuring string, whereby the oscillation excitation of the attachment point, originating from the string, may be reduced (relative to the minimum excitation which is obtained in the case of a symmetrical arrangement of the perforation).
  • the rear face of the body member contains a recess that communicates with a through bore, clamping means being mounted in the recess which include a bearing portion that extends through the bore for connection with the lower end of the vertically arranged vibratory string.
  • the demensions of the rear recess are such that the clamping means is isolated from the console or support to which the body member is attached, whereby the necessity of additional electrical insulation is avoided.
  • the structural component on its side remote from the console, includes protrusions for the lateral guidance of the exciter magnet system.
  • the protrusions carry opposed lugs which form a stop for the exciter magnet system, said stop being remote from the console.
  • a covering hood formed of synthetic plastic material, is fitted upon the shaped part to cover the exciter magnet system. This means that, in addition to a certain protection against dirt, an acoustic screen is also provided. As a further development of the basic concept, recesses are provided in the front face of the body member whch are used to fix the covering hood in place.
  • FIG. 1 is a front elevational view of the molded body member of the weighing apparatus of the present invention, with certain parts removed;
  • FIGS. 2 and 3 are sectional views taken along lines 2--2 and 3--3, respectively, of FIG. 1.
  • the string-type measuring apparatus includes a mounting block or body member 10 that is molded from a suitable synthetic plastic material (for example, a polyamide) having the configuration of a block with planar parallel front and rear surfaces 10a and 10b, respectively, and a slanted end portion.
  • the body member contains a pair of apertures 12 by means of which the body member may be secured to a console or fixed support S, as shown in FIG. 2.
  • the apertures 12 are asymmetrically arranged on opposite sides of the vertical plane illustrated by the line 3--3 in FIG. 1.
  • the body member 10 contains a through bore 14 that communicates at one end with a recess 16 formed in the rear face 10b of the body member 10, as shown in FIG. 3.
  • clamp means 36, 38 including a bearing portion 36a that extends forwardly through the bore 14 for connection with the lower end of the vertically arranged string 32.
  • a through passage 18 Arranged directly above the through bore 14 is a through passage 18 of rectangular cross-section.
  • a pair of integral vertically extending parallel spaced wing-like projections 20 Arranged symmetrically on opposite sides of the rectangular passage 18 are a pair of integral vertically extending parallel spaced wing-like projections 20, the adjacent surfaces of which are provided a pair of inwardly projecting stop lugs 22, respectively.
  • additional recesses might be provided in the body member for purposes of strength and/or for mass production reasons.
  • the string-type measuring system includes an exciter magnet system that is inserted forwardly from the rear side of the body member 10 through the passage 18, as shown in FIG. 2.
  • the exciter magnet means includes a permanent magnet 26, and a pair of ferromagnetic pole shoes 28a and 28b, respectively, which pole shoes extend forwardly beyond the permanent magnet 26 into abutting engagement with the stop lugs 22, respectively.
  • the permanent magnet system may be adhesively secured to the body member 10 by means of a suitable adhesive.
  • the pole shoes 28a and 28b include inwardly extending barbed extensions 30a, 30b, respectively, that define stop means limiting the extent of forward displacement of the permanent magnet 26 relative to the body member 10.
  • THe string which is provided with conventional nodal masses 34a and 34b --extends upwardly from the bearing portion 36a and is secured at its upper end with a force transmission member (not shown in detail).
  • the adjustable clamping means 36, 38 may be secured in place by means of the lock nut 39.
  • the size of the recess 16 is such that the clamping means 36, 38 is electrically isolated by an airgap from the support or console S.
  • the instrument may include a generally U-shaped covering hood 40 made of a synthetic plastic material, which covering hood includes a pair of horizontally extending leg portions 42 that extend adjacent the outer surfaces of the wing-like projections 20 and terminate in the pair of front recesses 24.
  • the covering hood 40 covers not only the permanent magnet exciter system but also the nodal masses 34a, 34b.
  • the resilient tension between the leg portions 42 may be sufficient to maintain the cover 40 in the illustrated covering position of FIG. 2.
  • the ends of leg portions 42 may include inner projections 44 which resiliently snap into apertures 46 provided in body member 10 for retaining the hood 40 in position.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Details Of Measuring And Other Instruments (AREA)
  • Stringed Musical Instruments (AREA)
US06/448,483 1982-05-11 1982-12-10 Measuring apparatus of the vibratory string type Expired - Fee Related US4470314A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2915/82A CH656480A5 (de) 1982-05-11 1982-05-11 Bauteil fuer ein saitenmessgeraet.
CH2915/82 1982-05-11

Publications (1)

Publication Number Publication Date
US4470314A true US4470314A (en) 1984-09-11

Family

ID=4244482

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/448,483 Expired - Fee Related US4470314A (en) 1982-05-11 1982-12-10 Measuring apparatus of the vibratory string type

Country Status (4)

Country Link
US (1) US4470314A (de)
JP (1) JPS58172843U (de)
CH (1) CH656480A5 (de)
DE (1) DE8309501U1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0556036A1 (de) * 1992-02-14 1993-08-18 Gec Avery Limited Befestigung von Kraftsensoren

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1995305A (en) * 1928-10-10 1935-03-26 Harvey C Hayes Method and apparatus for determining the force of gravity
US3020702A (en) * 1958-09-02 1962-02-13 Feldman Lawrence Timepiece movement
US3621713A (en) * 1969-02-28 1971-11-23 Wirth Gallo & Co Instrument for measuring masses and forces
US3712395A (en) * 1970-11-16 1973-01-23 Franklin Electric Co Inc Weight sensing cell
US3714406A (en) * 1970-04-09 1973-01-30 Decca Ltd Sealed housings for electronic or electrical equipment
US3897681A (en) * 1971-06-23 1975-08-05 Mettler Instrumente Ag Force measuring apparatus of the vibratory string type

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1995305A (en) * 1928-10-10 1935-03-26 Harvey C Hayes Method and apparatus for determining the force of gravity
US3020702A (en) * 1958-09-02 1962-02-13 Feldman Lawrence Timepiece movement
US3621713A (en) * 1969-02-28 1971-11-23 Wirth Gallo & Co Instrument for measuring masses and forces
US3714406A (en) * 1970-04-09 1973-01-30 Decca Ltd Sealed housings for electronic or electrical equipment
US3712395A (en) * 1970-11-16 1973-01-23 Franklin Electric Co Inc Weight sensing cell
US3897681A (en) * 1971-06-23 1975-08-05 Mettler Instrumente Ag Force measuring apparatus of the vibratory string type
US3963082A (en) * 1971-06-23 1976-06-15 Mettler Instrumente Ag Force measuring apparatus of the vibratory string type

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0556036A1 (de) * 1992-02-14 1993-08-18 Gec Avery Limited Befestigung von Kraftsensoren

Also Published As

Publication number Publication date
CH656480A5 (de) 1986-06-30
JPS58172843U (ja) 1983-11-18
DE8309501U1 (de) 1983-11-03

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AS Assignment

Owner name: METTLER INSTRUMENTE AG, CH-8606 GREIFENSEE, SWITZE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WEBER, PETER;REEL/FRAME:004076/0577

Effective date: 19821130

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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

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Year of fee payment: 4

AS Assignment

Owner name: METTLER-TOLEDO AG (METTLER-TOLEDO SA) (METTLER-TOL

Free format text: CHANGE OF NAME;ASSIGNOR:METTLER INSTRUMENTE AG;REEL/FRAME:005612/0036

Effective date: 19900529

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19920913

FP Lapsed due to failure to pay maintenance fee

Effective date: 19920913

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362